Question

我在PHP中使用JavaScript来保留表单值。表单的一部分是动态生成的，因此基于用户的子项（它是保险表单）。因此，有时根据用户的输入，某些PHP值根本不存在（如果用户只选择了一个子节点，则$ childBirthyear2将不存在）。显然这会带来Javascript的问题。

我知道我可以用条件语句解决它。事实并非如此。我仍然得到同样的错误，我在实现条件之前，特别是：

Timestamp: 7/16/2016 6:53:15 PM
Error: SyntaxError: expected expression, got ')'
Source File: https://insurancemidam.com/test/confirmation.php
Line: 665, Column: 41
Source Code:
  cycleSelectOptions('#childBirthyear3', );

现在我理解为什么它会收到错误（代码，在浏览器中运行之前，读取cycleSelectOptions('#childBirthyear3', $childBirthyear3 )并且$ childBirthyear3在此实例中不存在）;但是，我不太清楚为什么要达到此代码。要理解我的意思，这就是代码对浏览器的看法：

cycleSelectOptions('#childBirthyear1', 1900);
cycleSelectOptions('#childBirthday1', 01);
cycleSelectOptions('#childBirthmonth1', 11);


if(2 >= 2) {
  cycleSelectOptions('#childBirthyear2', 1900);
cycleSelectOptions('#childBirthday2', 01);
cycleSelectOptions('#childBirthmonth2', 01);
}

if(2 >= 3) {
  cycleSelectOptions('#childBirthyear3', );
cycleSelectOptions('#childBirthday3', );
cycleSelectOptions('#childBirthmonth3', );
}
 if(2 >= 4) { cycleSelectOptions('#childBirthyear4', );
cycleSelectOptions('#childBirthday4', );
cycleSelectOptions('#childBirthmonth4', );
}

 if(2 >= 5) { cycleSelectOptions('#childBirthyear5', );
cycleSelectOptions('#childBirthday5', );
cycleSelectOptions('#childBirthmonth5', );
}

 if(2 >= 6) { cycleSelectOptions('#childBirthyear6', );
cycleSelectOptions('#childBirthday6', );
cycleSelectOptions('#childBirthmonth6', );
}
 if(2 >= 7) { cycleSelectOptions('#childBirthyear7', );
cycleSelectOptions('#childBirthday7', );
cycleSelectOptions('#childBirthmonth7', );
}
 if(2 >= 8) { cycleSelectOptions('#childBirthyear8', );
cycleSelectOptions('#childBirthday8', );
cycleSelectOptions('#childBirthmonth8', );

这是原始的PHP

if($hasChildren) {
echo" 
if($childBirthyear1) {
  cycleSelectOptions('#childBirthyear1', $childBirthyear1);
cycleSelectOptions('#childBirthday1', $childBirthday1);
cycleSelectOptions('#childBirthmonth1', $childBirtmonth1);
}

if($childBirthyear2) {
  cycleSelectOptions('#childBirthyear2', $childBirthyear2);
cycleSelectOptions('#childBirthday2', $childBirthday2);
cycleSelectOptions('#childBirthmonth2', $childBirtmonth2);
}

if($childBirthyear3) {
  cycleSelectOptions('#childBirthyear3', $childBirthyear3);
cycleSelectOptions('#childBirthday3', $childBirthday3);
cycleSelectOptions('#childBirthmonth3', $childBirtmonth3);
}
 if($childBirthyear4) { cycleSelectOptions('#childBirthyear4', $childBirthyear4);
cycleSelectOptions('#childBirthday4', $childBirthday4);
cycleSelectOptions('#childBirthmonth4', $childBirtmonth4);
}

 if($childbirthyear5) { cycleSelectOptions('#childBirthyear5', $childBirthyear5);
cycleSelectOptions('#childBirthday5', $childBirthday5);
cycleSelectOptions('#childBirthmonth5', $childBirtmonth5);
}

 if($childBirthyear6) { cycleSelectOptions('#childBirthyear6', $childBirthyear6);
cycleSelectOptions('#childBirthday6', $childBirthday6);
cycleSelectOptions('#childBirthmonth6', $childBirtmonth6);
}
 if($childBirthyear7) { cycleSelectOptions('#childBirthyear7', $childBirthyear7);
cycleSelectOptions('#childBirthday7', $childBirthday7);
cycleSelectOptions('#childBirthmonth7', $childBirtmonth7);
}
 if($childBirthYear8) { cycleSelectOptions('#childBirthyear8', $childBirthyear8);
cycleSelectOptions('#childBirthday8', $childBirthday8);
cycleSelectOptions('#childBirthmonth8', $childBirtmonth8);";
}

我认为有问题的代码不会被执行 - 毕竟2不是＆gt; = 3。

感谢您的帮助！

Answer 1

我认为在尝试在JavaScript字符串中使用它们之前，您需要为PHP中的那些变量设置一些值。也许是一些简单的事情：

if($hasChildren) {
    echo "
    ...
    cycleSelectOptions('#childBirthyear3', " . ((isset($childBirthyear3))?$childBirthyear3:"''") . ");

    ...";
}

如果没有设置PHP变量，那么在JS中插入一个空字符串...当然，你可以用你喜欢的任何东西替换那个“默认”值。

Javascript - 以错误条件运行代码

1 个答案: